diff --git a/docs/installation.rst b/docs/installation.rst
index 6c25053..c948d40 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -182,8 +182,8 @@
 If you want to build cryptography yourself or are on an older OS X version
 cryptography requires the presence of a C compiler, development headers, and
 the proper libraries. On OS X much of this is provided by Apple's Xcode
-development tools.  To install the Xcode command line tools (on 10.9+) open a
-terminal window and run:
+development tools.  To install the Xcode command line tools (on OS X 10.9+)
+open a terminal window and run:
 
 .. code-block:: console